Whisenhunt left Monday's start against the Reds due to an apparent left arm injury, Gordon Wittenmyer of The Cincinnati Enquirer reports. He allowed two hits and one walk while striking out three over 2.2 scoreless innings prior to exiting.
Whisenhunt walked off the field with team trainers in the top of the third inning, though the severity of the injury remains unclear. He'll likely be sent for further tests to determine whether he'll require a trip to the injured list.